"I think it’s worthy of looking at it. I think the president needs to say what he intends to do," Manchin said during a West Virginia Senate debate.

"I think there’s a lot can be done, and a lot can be controlled, but he cannot do it by an executive order," the senator added, arguing the president can't unilaterally change the Constitution.

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Manchin's opponent, Republican Patrick Morrisey, said Trump is "right to look at the birthright lottery," but added he would want to see the president's executive order to ensure it's being handled the right way.